EAN25 / MOD 100 / Aver D 90 / BT 20 min
Deco on back-gas required:
1st stop 50 (1 min)
2nd stop 40 (1 min)
3rd stop 30 (1 min)
Final stop 20 (15 mins)
Total dive time 40 mins
According to this, a fairly conservative program, I will admit, 12 mins of deco were likely omitted.
The rule then would have been for 24-48 hours of surface interval before diving again.
Had the required deco time been accomplished, then the min surface interval would have been 2 to 3 hours before the 2nd dive because the N2 loading appears to have been at the limits.
This is what I suspect was problematic with these dives:
1) Deco time insufficient
2) Surface interval time insufficient
3) Bottom mix choice (ideal would be TMX 30/30, 2nd place EAN36, 3rd place EAN32)
4) Deco mix choice (ideal would be either EAN 50 or 100% O2)
Rockjock, I hope you get well soon and feel better. You need better deco software however, and/or you need to set it to a more conservative setting. None of us is simply 21 anymore, and therefore USN tables simply do not work.
Your humble servant, NEREAS
When I double checked all my above calculations over the weekend, I found that my software was set for high altitude diving. Therefore I wanted to set the record straight with corrections, although without further fanning of the flames here:
Dive #1 EAN25 / MOD 100 / Aver D 90 / BT 20 min
Egression stops required:
Initial deco ceiling warning, but cleared during normal ascent;
Remaining NDL time -0-;
15 fsw stop for 3 mins;
Total required dive time including ascent and stops: 27 mins.
According to this, which is a very conservative program, there was no actual deco obligation during the first dive, just a deco ceiling warning at first, which then cleared during ascent.
Surface interval: 1 hr 33 mins
Dive #2 EAN25 / MOD 60 / Aver D 50 / BT 39 min
Egression stops required:
No deco warnings, remaining NDL time 4 mins;
15 fsw stop for 3 mins;
Total required dive time including ascent and stops: 44 mins.
1) Deco time was not required nor therefore omitted;
2) Surface interval time was fine.
As I said, I wanted to correct the record here regarding the computations. And without fanning the flames any further.
Teamcasa did a nice clean-up job on the thread.
Rockjock, I do hope you get well soon and feel better.
)
